I found myself with several bottles of Starbuck's Dark Chocolate Mocha Frappuccino and a bottle of Kahlua. I put a bottle of the frap into the freezer to chill thoroughly, opened and took a couple of swigs, then refilled the bottle the rest of the way with Kahlua. Instant Win! \o/
I can imagine how much better (read: potent) it would be if I'd had a splash of vodka to add . . .